i would of said wheel balancing. Drop your wheels off and just give everything a tug or nudge to see thats its all connected ok, tie rods etc. As for the panhard rod,when you lower the car i.e. bringing the axle closer to the body of the car, it shifts to the left(i think). the adjustable panhard rod, allows you to re-align it. it wouldnt explain why your cars all over the place, unless the chassis sitting on the wheel lol Mitch